docs: def raise_for_redefined_namespace(self, line: str, position: int, namespace: str) -> None:
          """Raise an exception if a namespace is already defined.
  
          :raises: RedefinedNamespaceError
          """
          if self.disallow_redefinition and self.has_namespace(namespace):
              raise RedefinedNamespaceError(self.get_line_number(), line, position, namespace)